In the binomial expansion of (a-b)^*, n \geq 5 the sum of the 5^{\text{th }} and 6^{\text{th }} terms is zero. Then, \frac{a}{b} equals

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In the binomial expansion of (a−b)*,n≥5 the sum of the 5‌th ‌ and 6‌th ‌ terms is zero. Then, ‌

equals

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